1、新增首页合计详情页；

2、新增索引和缓存；

internal/router/cache.go

@@ -0,0 +1,115 @@
+package router
+
+import (
+	"bytes"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+const (
+	responseCacheTTL     = 5 * time.Minute
+	responseCacheMaxBody = 4 << 20
+	responseCacheMaxKeys = 512
+)
+
+type responseCacheEntry struct {
+	status      int
+	contentType string
+	body        []byte
+	expiresAt   time.Time
+}
+
+type responseCacheStore struct {
+	mu    sync.RWMutex
+	items map[string]responseCacheEntry
+}
+
+func newResponseCacheStore() *responseCacheStore {
+	return &responseCacheStore{items: make(map[string]responseCacheEntry)}
+}
+
+func (s *responseCacheStore) get(key string) (responseCacheEntry, bool) {
+	now := time.Now()
+
+	s.mu.RLock()
+	entry, ok := s.items[key]
+	s.mu.RUnlock()
+	if !ok {
+		return responseCacheEntry{}, false
+	}
+	if now.After(entry.expiresAt) {
+		s.mu.Lock()
+		if current, exists := s.items[key]; exists && now.After(current.expiresAt) {
+			delete(s.items, key)
+		}
+		s.mu.Unlock()
+		return responseCacheEntry{}, false
+	}
+	return entry, true
+}
+
+func (s *responseCacheStore) set(key string, entry responseCacheEntry) {
+	s.mu.Lock()
+	if len(s.items) >= responseCacheMaxKeys {
+		now := time.Now()
+		for cacheKey, current := range s.items {
+			if now.After(current.expiresAt) || len(s.items) >= responseCacheMaxKeys {
+				delete(s.items, cacheKey)
+			}
+		}
+	}
+	s.items[key] = entry
+	s.mu.Unlock()
+}
+
+type cachedResponseWriter struct {
+	gin.ResponseWriter
+	body *bytes.Buffer
+}
+
+func (w cachedResponseWriter) Write(data []byte) (int, error) {
+	w.body.Write(data)
+	return w.ResponseWriter.Write(data)
+}
+
+func cacheableGETResponseMiddleware(store *responseCacheStore) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if c.Request.Method != http.MethodGet || strings.HasPrefix(c.Request.URL.Path, "/api/v1/download/") {
+			c.Next()
+			return
+		}
+
+		key := c.Request.URL.RequestURI()
+		if entry, ok := store.get(key); ok {
+			c.Header("Content-Type", entry.contentType)
+			c.Data(entry.status, entry.contentType, entry.body)
+			return
+		}
+
+		body := bytes.NewBuffer(nil)
+		writer := cachedResponseWriter{ResponseWriter: c.Writer, body: body}
+		c.Writer = writer
+		c.Next()
+
+		status := c.Writer.Status()
+		if status != http.StatusOK || body.Len() == 0 || body.Len() > responseCacheMaxBody {
+			return
+		}
+
+		contentType := c.Writer.Header().Get("Content-Type")
+		if !strings.Contains(contentType, "application/json") {
+			return
+		}
+
+		store.set(key, responseCacheEntry{
+			status:      status,
+			contentType: contentType,
+			body:        append([]byte(nil), body.Bytes()...),
+			expiresAt:   time.Now().Add(responseCacheTTL),
+		})
+	}
+}

internal/router/router.go

@@ -9,7 +9,8 @@ import (
 //
 // 函数集中注册跨域中间件和 v1 版本接口，调用方只需要注入各业务 Handler。
 func NewRouter(commonApi *api.CommonHandler, stockApi *api.StockHandler, limitBoardApi *api.LimitBoardHandler) *gin.Engine {
-	r := gin.Default()
+	r := gin.New()
+	r.Use(gin.Recovery())
 
 	// 跨域中间件允许前端从任意来源访问接口，并暴露 CSV 下载需要的 Content-Disposition。
 	r.Use(func(c *gin.Context) {
@@ -23,6 +24,7 @@ func NewRouter(commonApi *api.CommonHandler, stockApi *api.StockHandler, limitBo
 		}
 		c.Next()
 	})
+	r.Use(cacheableGETResponseMiddleware(newResponseCacheStore()))
 
 	v1 := r.Group("/api/v1")
 	{